Is this guy crazy?

[dyeager535]

9.2:1 on 87 octane at sea level. Total timing doesn't mean anything, it depends what the engine wants.

10:1 with the right components is entirely doable on 91 octane, GM does it all the time!

 

[theperfectgarage]

We must also consider, carbed? F.I.? comp. controlled ign. timing?
All must be considered to make valid arguments. And did'nt I read one time that Dorian Yeager knows nothing about working on cars ?

 

[beater_k20]

apparently the *perfect* garage isnt so perfect either. all ignition and fuel problems associated with TBI aside, and depending on cam timing, a 10:1 engine can safely be run on 87 octane with iron heads. good chambers and a proper quench distance are a must at that point, but it can be done.

 

[theperfectgarage]

Only thing perfect about my place is the temp. of the beer. But seriously, I agree that if conditions are right, many things can be done that I would never advise in a forum like this. Face to face with a client at my place, different story. You already know, that on ck5 my advice is on the conservitive side.
Having said that, I'll stick to the story that generally speaking, top engine builders don't advise more than about 9.2 to one with iron heads and pump gas.

 

[1-ton]

10:1 engine can safely be run on 87 octane with iron heads. good chambers and a proper quench distance are a must at that point, but it can be done.

This is a subject that has been hashed out many times here. I think that 'yes' it can be done (hell, a 12:1 engine could be forced to do it), but the question is...do you want to? Also, why is it that every GM car, which comes with a 10:1 compression engine (like a GTO), recommend using 89 octane gas?

 

[jimmy'sjimmy]

Any comments on a summit kit internally balanced? Does it still need to be balanced at a machine shop? or anyone in college station or austin know where i can get a kit?